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.              PLOKA INDICA.                                   247

BISTETB. America borealis, a Canada ad flum. Mississippi! Australia
orientalis.

Fedunculus pubescens, apice infra florem incrassatns. Flos % unc. longus. Sepala,
S, lineari-oblonga v. linean-obovata, obtusa, dorso setulis caruosulis conicis pubes-
centia, concava, basi crassa. Petafa 4, sepalis £ longiora, perigyna, rosea, basi dis-
tantia; anguste lineari-obkmga, apicibus incurvis obtusis, dorso basi puberula. Sta-
mina sub-12, obscure biseriata, hypogyna, carpellis opposita et. alteraa, fikmentis
. cylindricis demum elongatis puberulis; antheris linearibus glabris, rimis lateralibns.
Pollen (in alcohol conservatum) irregulariter globosum, opacum, obscure granulosum,
disco pellucido angustissimo circumdatum. Carpella, 10, disco piano inserta, 2-
seriata, sessilia, linearia, cylindracea, pubernla. Ovula 2, pendula, anatropa, raphe
ad suturam versa. 4 Gcujpella, matura 8 v. plora, turgida, coriacea, indehiscentia, ^tig-
mate persistente cuspidate, submonosperma. Semen magnum, ovoideumj testa
Crustacea, laevi. Albumen farinacemn, et etndryo ut in Nymphaa.

XEH. NBLUMBIACE^l.
Sepala 4-5 5 imo toro inserta, decidua. Petc&a plnrima, multiseriata,
libera, decidua. Stamitta pliirima, cum petalis imo toro multiplici
serie inserta; filamentiz supra antheram in appendicem productis; an-
tJt&ris introrsis, loculis adnatis. Torus carnosus, obconicus, apice lato
truncate. Ovttria plurima, foveolis apicis plan! tori sin^illatini basinxis,
unilocularia; stigmate discoideo subsessili. Ovulum solitarium. v. 2
collaterally suspensum, funicwlo filiformi parieti ovarii affixo; rapTie dor-
sali. Nitces subglobosse, stylo superatse, coriaceo-cornese, e tori foveolis
semi-emersee, longitudinaliter obscure dehiscentes. Semen inversum,
testa spongiosa; embryo exalbuminosus, orthotropus; cotyledones crasse
carnosae, plumulam diphyllam valde evolutam foventes, petiolis inflexis
vagina stipulari inclusis; radicula brevissima.—Herbs, rhizomate elon-
gate korizontali, foliis long* crasse petiolatis, lamina peltata integerrima
nervia radiantibus marginibus vernations involutis, floribus amplis,
We have, under the Order NympTueacea^ considered Nelwnbium as a member of
the group Nymphales, and stated some of our objections to IVT. Tre*cuTs opinion, that
these two Orders have nothing'in common, but their numerous petals and stamens,
and the' medium they inhabit. The most prominent differences between them reside
in the form and structure of the rhizome, the development of the leaves, the deci-
duous perianth and stamina, and the remarkable development of the torus, the sessile
small carpels, with one (rarely two collateral) pendulous ovulum, and the exalbuminous
seeds, with a very highly-developed plumule. Though these distinctions appear so
great, they are much diminished in value by a study of Brasenia, which, in its
rhizomes and mode of growth, is as different from NympJiaa as Nelumbium is, and
whose ovaria are of exactly intermediate structure. The great torus of Nelumbium
is a peculiar development of that ofNympfaa; and, as Asa Gray has demonstrated, the
embryo of Nympheeea and Oa6omof& is just that of Nefam&ium ,on a smaller scale.
If the germinating seed of Nympfuca be compared with the embryo of Nelwnoium,
the affinity is very obvious; the principal modifications being the inflezed petioles of
the plumule of the latter plant, and the stipulary sheath enclosing it, which last is
perhaps analogous to the sheath, enclosing the first leaf within the primary pair of
leaves of Nymphaa, Trecul has admirably illustrated the anatomy and development
of Nelumbium codophyUum (Ann. Se. Nat. Ser. i 291), and made some most im-
portant and interesting observations on the mode of growth, of the leaves and pe-